Imaginary Picture of HD 178911 B b

Display orbital revolution of HD 178911 B b around the hoststar HD 178911 B
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Exoplanet Name : HD 178911 B b
Alternate Name :
Status : Confirmed
Radius (Rjup / Re): 0.9078 (Rjup) 10.1759 (Rearth)
Mass (Mjup / Me): 6.2920 (Mjup) 2000.4659 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.3200 (AU) 0.3200 (AU Est.)
Eccentricity : 0.1243
Orbital Period(Yrs) 0.1957
Orbital Period(Observed/Estimated) 71.49 (Days Obs.) 63.92 (Days Est.)
Surface Gravity (G Earth) 19.3192
Star Radiation at Atmospheric Boundary: 15860.2 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 500.9 (K)
Blackbody T 0.3(K) 470.4 (K)
Blackbody T 0.7(K) 380.6 (K)
Tidally Locked Blackbody T 0.1(K) 595.6 (K)
Tidally Locked Blackbody T 0.3(K) 559.4 (K)
Size Class: Jupiter-size
Mass Class:
Detection Type : Radial Velocity
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : HD 178911 B
Alternate Name :
Star Distance(LY) : 135.4
Stellar Radius(Rsun) : 1.1 (Rsun Measured)
Stellar Mass(Msun) : 1.1 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 5.2 (GY)
Temperature : 5650 (K)
Spectral type : G5
UV portion[%]: 7.4
Visible portion[%]: 44.1
IR portion[%]: 48.4
Metalicity : 0.3
Absolute Magnitude: 4.9
Apparent Magnitude: 8.0
Right Ascension(RA) 287.2629
Declination (DEC) 34.5997
Hubble Space Telescope Guide Star Catalog (GSC) ID 02648-02151
Discovered by
Discovery Paper - Authors "S. Zucker , D. Naef , D. W. Latham , M. Mayor , T. Mazeh , J. L. Beuzit , G. Drukier and, C. Perrier-Bellet , D. Queloz , J. P. Sivan , G. Torres, S. Udry"
Discovery Paper - Title A Planet Candidate in the Stellar Triple System HD178911
Discovery Paper - Journal "The Astrophysical Journal,olume 568,umber 1"
Discovery Paper - URL http://iopscience.iop.org/article/10.1086/338892/meta
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+178911+B+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/HD%20178911%20B%20b/
HD 178911 B b
HD 178911 B b

  • HD 178911 B b is an exoplanet orbiting the star HD 178911 B, located about 135.4 light-years (41.5 pc) away from Solar System. Its discovery was publicly announced on 2001.
  • The host star HD 178911 B has apparent magnitude of 8.0, with absolute magnitude of 4.9.
  • It is 1.1 times more massive and 1.1 times bigger compared with our Sun. The surface temperature is 5650 with its spectral types of G5
  • In this planetary system, the extrasolar planet HD 178911 B b orbits around the star HD 178911 B every 71.5 days with its orbital distance of 0.32 AU ( 47871318.6 km)
  • (Projected orbit of HD 178911 B b around its host star HD 178911 B)


  • The Star HD 178911 B 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.788 AU ( 117939656.7 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 1.090 AU ( 163023426.9 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 1.661 AU ( 248411625.6 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 2.444 AU ( 365548589.3 km)
  • Radiation at Planetary Boundary of HD 178911 B b : 15860.19 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star HD 178911 B)



  • Kopparapu Recent Venus for Star HD 178911 B distance : 0.823 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star HD 178911 B distance : 1.043 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star HD 178911 B distance : 1.007 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star HD 178911 B distance : 1.104 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 178911 B distance : 1.848 AU
  • Kopparapu Outer Boundary for Early Mars for Star HD 178911 B distance : 1.949 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star HD 178911 B)



  • Original Kopparapu Recent Venus for Star HD 178911 B distance : 0.822 AU
  • Original Kopparapu Runaway Greenhouse for Star HD 178911 B distance : 1.072 AU
  • Original Kopparapu Moist Greenhouse for Star HD 178911 B distance : 1.088 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star HD 178911 B distance : 1.880 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star HD 178911 B distance : 1.955 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star HD 178911 B)



    (Position in Stellar Map of star HD 178911 B and its Exoplanet HD 178911 B b)



    (Zoomed position in Stellar Map of star HD 178911 B and its Exoplanet HD 178911 B b (zoom level 3))

    (Synthetic Spectrum of star HD 178911 B*)
    *Yamashiki YA et al. 2019 ApJ 881 114
    MUSCLES Paper I - France et al. 2016 ApJ 820 89
    MUSCLES Paper II- Youngblood et al. 2016 ApJ 824 101
    MUSCLES Paper III- Loyd et al. 2016 ApJ 824 102